why did my intake valve stick?
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why did my intake valve stick?

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    WHERE I AM IDAHO 392 cruiser's Avatar
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    Default why did my intake valve stick?

    why did my intake valve stick? ok my 3892 hemi dropped a valve this weekend after several long hours of on and off the throttle cruising in and bammmmm, intake valve stuck spacked the piston. tore it down looked like sandy metal particles welded to the valve stem all other fine. anybody know why???? just one????

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    Senior Member MACHINEHEAD1's Avatar
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    Stick or dropped. Pick one

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    gn7
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    Quote Originally Posted by 392 cruiser View Post
    why did my intake valve stick? ok my 3892 hemi dropped a valve this weekend after several long hours of on and off the throttle cruising in and bammmmm, intake valve stuck spacked the piston. tore it down looked like sandy metal particles welded to the valve stem all other fine. anybody know why???? just one????
    Were the heads done lately. Since the last time it ran? How many hrs are on the heads since they were done



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    WHERE I AM IDAHO 392 cruiser's Avatar
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    the rear intake stuck down, piston came up and hit it, it has been couple years since they have been rebuilt they had cast iron guides the rocker arm followed it down didnt come back up then the push rod came out and got slapped up inside by the cam follower too

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    gn7
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    Well that not exactly how it goes, but it is the general idea. The sticks, and the pushrod gets kicked because there is now over a 1/2 inch of lash. I would love to see those vlave guides. I they were knurled, you need to kick some butt. But if you have what looks like metal welded to the stems, it came from somewhere. And that somewhere may very well have been the peaks from the knurling. Do the inside of the guides look like they have threaded?



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    Did I understand that the heads were done a few years ago, but now just recently run? If so, then the pre-lube dried up during the down time and just burned instead of lubricating. Insufficient guide/valve clearance, were the heads done by a car shop, or a machinist that actually KNOWS boat motors? Food for thought. TIMINATOR
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    WHERE I AM IDAHO 392 cruiser's Avatar
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    the guides were smooth not knurled today i took them all apart found the same metal grit welded to 2 exhaust valves oppisite side... 3 time out this year ,ran it all last year no problems ,anyway off the the machine shop they went ordered all new bronze guides ,int. and ex. valves and seals gaskets etc ill put it back and run again the only new thing i put on was a mallorey fuel pump and 40 m9icron filter better have not been them ill be pissed if it does it again

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    Senior Member wagspe208's Avatar
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    1) Well, cast iron guides are not performance stuff. They are fast rebuilder stuff.
    2) Did you have seals on the guides? If so, what type.

    Obviously the stems galled. Lack of lube, or to hot (which rules out intake).
    Bronze is self lubricating and much tougher to stick a valve (not impossible, but damn near).

    Bronze guides, and proper clearances. I'd give the spec I run but then there will be the inevitable bitching, your a dumbass, etc.

    Good luck.
    Wags

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    WHERE I AM IDAHO 392 cruiser's Avatar
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    im guessing i ran lean some how. it has dual edelbrocks and all the valves that had the particles of seizing guides were on the front of the engine like under 1 of the carbs i dont know.thats why i posted it to see if im the only one that has ever done it

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    Senior Member EVILFORCE's Avatar
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    What kind of boat is this? Jet...V-Drive? If it is a V-Drive did you check your waterpump? Could have lost your impeller and ran it to hot and galled the guides. Let us know what caused it.
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    Quote Originally Posted by wagspe208 View Post
    1) Well, cast iron guides are not performance stuff. They are fast rebuilder stuff.
    2) Did you have seals on the guides? If so, what type.

    Obviously the stems galled. Lack of lube, or to hot (which rules out intake).
    Bronze is self lubricating and much tougher to stick a valve (not impossible, but damn near).

    Bronze guides, and proper clearances. I'd give the spec I run but then there will be the inevitable bitching, your a dumbass, etc.

    Good luck.
    Wags

    You are entertaining.
    Surely if your stuff is working you must have the wrong clearance.
    Bet you don't run seals on the intakes either. Or are you one of those "leave the seal springs off" kind of guys?
    Last edited by Fiat48; 07-08-2010 at 10:11 PM.

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    gn7
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    Quote Originally Posted by wagspe208 View Post
    1) Well, cast iron guides are not performance stuff. They are fast rebuilder stuff.


    Good luck.
    Wags
    When did cast iron guides become "fast rebuilder stuff" Every head I have ever seen with replaceable iron guides, it was considerably harder to replace the guide, than install a bronze liner. The guide itself may be easy to replace, but getting the seat concentric again is a little more work



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    Last edited by gn7; 07-08-2010 at 10:32 PM.

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    Senior Member cakeeater ed's Avatar
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    Quote Originally Posted by 392 cruiser View Post
    why did my intake valve stick? ok my 3892 hemi dropped a valve this weekend after several long hours of on and off the throttle cruising in and bammmmm, intake valve stuck spacked the piston. tore it down looked like sandy metal particles welded to the valve stem all other fine. anybody know why???? just one????
    Did the push rod possibly jump to the side of lifter? Look at that lifter really,really,REALLY GOOD.

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    Senior Member cakeeater ed's Avatar
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    Quote Originally Posted by 392 cruiser View Post
    the guides were smooth not knurled today i took them all apart found the same metal grit welded to 2 exhaust valves oppisite side... 3 time out this year ,ran it all last year no problems ,anyway off the the machine shop they went ordered all new bronze guides ,int. and ex. valves and seals gaskets etc ill put it back and run again the only new thing i put on was a mallorey fuel pump and 40 m9icron filter better have not been them ill be pissed if it does it again
    OPP"S should have read this thread better,V8's spread carneag thru the whole eng. quickly, The "grit" on the ex valves might be piston ring land from detionation (on a boat you don't hear it) Look at those pistons with a big light & strong glasses.

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